<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.a{
				width: 600px;
				height: 800px;
				background-color: #00FFFF;
			}
			.b{
				height: 100px;
				width: 100px;
				padding: 10%;
				background-color: red;
				/* background-clip: content-box; */
			}

		</style>
	</head>
	<body>
		<div class="a"><div class="b">我是谁</div></div>
	</body>
</html>
